C. occidentalis may refer to:
- plant
- Calyptronoma occidentalis, a palm species endemic to Jamaica
- Canna occidentalis, a garden plant
- Carex occidentalis, a sedge species
- Celtis occidentalis, the common hackberry, a tree species native to North America
- Cephalanthus occidentalis, the buttonbush, a flowering plant species native to eastern and southern North America
- Cercis occidentalis, the western redbud, a tree native to western North America
- animal
- Crenadactylus occidentalis, tiny gecko species native to Western Australia
See also
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